You can only get a maximum of 200 reputation in a single day. Therefore the answer is: Lots of people get highest reputation in a single day. (Unless bounty awards get handled differently, I'm not sure).
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JonWJan 7 '13 at 11:58

5

@JonW No, you can get much more. Question accept (15 rep points) are for example immune from the rep cap.
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Denys SéguretJan 7 '13 at 12:05

I think I've got 335 in one day... 20 upvotes and 9 accepts - but no bounties on top - so I could imagine, a 1000 is perfectly plausible if a couple of bounties fell on the same day...
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Jon ClementsJan 7 '13 at 12:06

I've once reached 947 in a single day on SO. I however recall having seen someone going over 1K with 2 high-rep bounties awarded the same day. Not sure who it was. Something with "Gomez" in the name? And here on meta.SO, due to some bug I've a (incorrect) peak of 1154 in my graph :(
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BalusCJan 7 '13 at 12:18

@Chichiray: that would be MrGomez, 1225 in a single day.
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MatJan 7 '13 at 12:24

Yes, that was him :) He went really on a bounty spree that period.
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BalusCJan 7 '13 at 12:26

3

I think my highest in a day without bounties is 650 (September 28th 2011). I believe others have done better, very occasionally. Including bounties, my highest is 870 (so far lower than MrGomez).
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Jon SkeetJan 7 '13 at 12:52

@JonSkeet - But your average is just awesome and unbeatable. :(
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hims056Jan 7 '13 at 12:53

3

@hims056: It certainly helps that the last time I didn't hit the rep cap was June 2010 :)
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Jon SkeetJan 7 '13 at 12:57

@him056: thats exactly i am talking about. why they have make it like this? if we are able to know leader of week/month/year than why dnt of single day? i knew what you have written as answer.
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BhaveshJan 7 '13 at 12:02

2

@Bhavesh - Why don't of single day? because of time difference in all over the world.
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hims056Jan 7 '13 at 12:05

@hims056 yes, a day is a day from UTC on SO - not a 24 hour shifting period...
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Jon ClementsJan 7 '13 at 12:08

@hims056: sory but i do not agree with you fully. cz if that would be problem then it would also be hurdle for week/month/year.
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BhaveshJan 7 '13 at 12:08

You can get reputation (aggregate) from the data explorer, but not in the way you'd need to do a query for this.
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Tim Post♦Jan 7 '13 at 12:22

@TimPost - To do a query we need a table where we can separate reputation somehow. Also, we don't get nagetive reputation (for downvoting) of any user.
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hims056Jan 7 '13 at 12:46